Katerina Swanson
Fuel lines are an essential component of any vehicle, and determining the appropriate fuel line size is critical to ensuring optimal performance. The diameter of a fuel line can significantly impact the overall functionality of the vehicle, including its horsepower capabilities. Various factors, such as pressure loss, fuel flow rate, and system pressure, come into play when determining the ideal fuel line size. Different vehicles, such as EFI and carbureted systems, have unique requirements, and selecting the right fuel line can enhance performance and efficiency. In this discussion, we delve into the intricacies of fuel line sizing, exploring the factors that influence fuel line selection and offering insights into making informed choices to meet specific automotive needs.
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What You'll Learn
Fuel line diameter
In terms of specific diameters, fuel lines commonly range from 3/8" to 1/2" in internal diameter (ID). A 3/8" ID fuel line, for instance, can support up to 600 horsepower with sufficient "pump head". With a powerful enough pump, a 3/8" steel line could even support 1000 horsepower. On the other hand, a 1/2" ID fuel line may not be necessary for most applications and could result in longer pressurization times.
When selecting a fuel line diameter, it is essential to consider the recommendations of in-line fuel pump manufacturers. They often specify a fuel line diameter that works optimally with their pumps to prevent starving the pump. Additionally, factors such as fuel type, engine specifications, and performance goals should be taken into account to ensure the fuel line diameter meets the requirements of the fuel system.
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Fuel line sizing
A fuel line with an insufficient diameter may not be able to support the desired horsepower goal. For example, a fuel line with a nominal 3/8" inner diameter (ID) can adequately support 600 horsepower (HP) with sufficient "pump head". However, if the horsepower goal is higher, a larger diameter may be necessary. On the other hand, a fuel line with too large a diameter can lead to issues as well. If the diameter is too big, the lines will take longer to pressurize, and if the pump cannot maintain the pressure, it may drop during periods of high demand, potentially causing engine damage.
It is worth noting that in-line fuel pump manufacturers often recommend a fuel line diameter that is optimised for their pumps. This helps prevent starving the pump and ensures efficient fuel delivery. Additionally, when designing a fuel system for alternative fuels like ethanol or methanol, it is important to consider their higher fuel requirements compared to gasoline. Ethanol requires approximately 30% more fuel, while methanol requires double the amount of fuel to generate the same horsepower as gasoline. As a result, the fuel line diameter for these alternative fuels should be one to two sizes larger than the gasoline requirement.
When determining the appropriate fuel line size, it is essential to consider factors such as the specific fuel type, horsepower requirements, pump capacity, and the length of the fuel line. By carefully evaluating these factors, one can ensure that the selected fuel line diameter meets the engine's performance needs without compromising efficiency or safety.
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Fuel line pressure drop
When planning a fuel delivery system, it is important to understand the relationship between fuel line size and fuel pressure. Fuel systems can be incorrectly designed if the pressure loss attributed to the length of the fuel lines is not taken into account. Excessive pressure drop in the fuel lines feeding a carburetor or EFI system will inhibit their proper function.
The source of pressure loss is friction. Fluids experience friction as they pass through pipes and hoses, and this drag reduces the pressure under which the fluid is being delivered. In the case of fuel lines, two factors increase friction and, therefore, fuel pressure drop: the length of the fuel line and the flow rate. The longer the fuel line, the more friction will be incurred. As the flow rate increases, so does friction. Every fuel line experiences pressure loss depending on fuel line length and fuel flow rate. It should be noted that fuel lines that feed pressure gauges experience the least amount of loss, as the flow rate through the gauge line plummets to near zero flow levels.
The diameter of a fuel line also matters. A larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small, you won't be able to support your horsepower goal. If the diameter is too big, the lines will take longer to pressurize. If your pump can't maintain the pressure, it can drop during times of high demand, leading to engine damage.
The pressure drop in a fuel line will have performance effects on the fuel system. For example, consider a carbureted fuel pump with a maximum possible flow rate of 160 GPH at free-flow. If the minimum required fuel system pressure for our example is 6 PSI (not accounting for other losses), the maximum flow rate to be considered is 110 GPH. Referring to the graph, the amount of pressure drop we can expect for 14' fuel lines at 110 GPH is not much. However, depending on how much pressure loss can be tolerated by the system before it affects performance, it could be a significant problem.
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Fuel line types
Neoprene Fuel Line
Neoprene fuel lines are widely used and available in various sizes, typically ranging from 1/8 inch to 5/8 inch in bulk rolls. They also offer larger sizes, such as 1-1/2 inch to 2-1/4 inch sections, for gas filler neck applications. Neoprene fuel lines are suitable for fuel, PCV, and EEC systems in vehicles with working pressures below 50 psi. They are also compatible with ethanol-laced fuels and diesel fuel but should not be used in coolant or oil systems.
Nylon Fuel Line
Nylon fuel lines are commonly found in late-model production cars, featuring hard, black nylon tubing with special connectors for attaching fuel-feed lines to the gas tank sending unit or fuel pump modules. Nylon tubing offers resistance to most fuel types, including nitro methane, and operates at pressures up to 250 psi. It has an operating temperature range of -30 to 120 degrees Celsius and is available in both rigid and flexible convoluted tubes. The convoluted tube is often used for the fuel pump-to-module connection within the tank.
SAE 30R9 Hose
The SAE 30R9 hose is specifically designed for EFI (Electronic Fuel Injection) systems that utilise hose clamps. It has a working pressure of 100 PSI and above and is compatible with various fuel types, including oxidized gasoline, diesel, methanol, and ethanol-blend fuels. This hose also resists fuel permeation, making it emissions-legal.
Stainless Steel Hard Line
Stainless steel hard lines are another option for fuel lines. They offer high durability and can withstand burst pressures of up to 780 psi.
Seamless Aluminium Hard Line
Seamless aluminium hard lines are a cost-effective choice for both high and low-pressure fuel lines. They offer a clean installation and exceptional durability. However, they may be more time-consuming to install compared to other options.
It is important to note that the choice of fuel line type depends on various factors, including the vehicle's specifications, fuel type, pressure requirements, temperature ranges, and personal preferences. Consulting a professional or referring to vehicle-specific guides can help ensure the selection of the most appropriate fuel line type for your needs.
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Fuel system plumbing
The next step is to choose the right hose and fittings for your system. The hose is the vital link that joins all the components together, and there are many options available. The first point to check is the type of fitting required. Most production cars will have push-on hoses, with 8mm bore being the most common. If your vehicle had a carburetor and you are upgrading to EFI, you can use the factory hard metal line as the return line and build a high-pressure feed line to feed the system.
When choosing a hose, it is important to consider the pressure requirements of your system. For high-pressure systems, a push-to-lock hose with rubber hose and internal weaved fabric can withstand pressures of around 300 psi. For interior use, a Teflon/PTFE-lined hose can prevent the escape of fuel vapour and eliminate the stale fuel smell. The fittings will need to be paired with the hose to ensure a strong connection, and the hose can be cut to length with reusable fittings in various configurations.
Finally, it is important to secure the fuel hose to protect it from heat and ensure it does not move. You should also test the system for leaks before use.
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